Sea potato

Sea potato may refer to :
 * Colpomenia peregrina, a species of brown algae more commonly known as oyster thief or bladder weed
 * Leathesia marina, formerly Leathesia difformis, another species of brown algae more commonly known as sea cauliflower
 * Species of littoral sea urchins, especially heart urchins
 * Echinocardium cordatum, a specific species of urchin, commonly known as common heart urchin.
 * Echinocardium flavescens, called the yellow sea potato